IOEGA has a driver file set generically called "Iomegaware". It contains
drivers for most of their products, certainly at least ZIP and JAZ.
Download the latest version and install it. See if they have a companion
set of instructions, since sometimes you need to install drivers first, then
hardware, and sometimes the reverse.
However, my own experiences with a parallel port ZIP indicate that it must
own the parallel port. It will not share it with a printer, at least not
without a lot of tweaking and rebooting.
Depending on what your time is worth, you might be a lot happier getting a
USB ZIP. Those are automatically supported by XP. Just plug in while at
the windows desktop and in a few seconds it will be ready to use.
Also, USB pen drives are fast becoming an alternative to ZIP.